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Cross-correlating spectroscopic and photometric galaxy surveys

Published online by Cambridge University Press:  01 July 2015

Martin B. Eriksen  and
Enrique Gaztañaga
Martin B. Eriksen
Affiliation:
Sterrewacht Leiden, University of Leiden, NL-2333 CA, Leiden, the Netherlands email: marberi@strw.leidenuniv.nl
Enrique Gaztañaga
Affiliation:
Institut de Ciencies de l'Espai (ICE-IEEC/CSIC), Campus UAB 08193 Bellaterra, Spain email: gazta@ice.cat
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Abstract

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Does photometric and spectroscopic survey benefit from overlapping areas? The photometric survey measures 2D Weak Lensing (WL) information from galaxy shape distortions. On the other hand, the higher redshift precision of an spectroscopic survey allows measurements of redshift space distortions (RSD) and baryonic accustic oscillations (BAO) from 3D galaxy counts.

The two surveys are combined using 2D-correlations, using sufficiently narrow bins to capture the radial information. This poster present effects of RSD and intrinsic correlations between narrow redshift bins. In understanding how the effects affects cosmological constrains, we first define two stage-IV and then present forecast for various configurations. When surveys overlap, they benefit from additional cross-correlations and sample variance cancellations from overlapping volumes. For a combined dark energy and growth history figure of merit, the result increase 50% for overlapping surveys, corresponding to 30% larger area.

Keywords

galaxies: distances and redshiftstechniques: spectroscopic surveys
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 213 - 215
Copyright
Copyright © International Astronomical Union 2015 

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